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From J. D. Hooker   25 August 1854

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Summary

JDH and F. W. Binney identify Calamites specimens as pith casts. They are cryptogams related to, but higher than, Lycopodiaceae and contradict progression.

Insects found in coal.

Lyell says Stonesfield slate marsupials are actually placentals.

JDH reading Alexander Braun on individuality ["Das Individuum der Pflanze in seinem Verhältniss zur Species", Abh. K. Akad. Wiss. Berlin (Phys. Kl.) (1853): 19–122].

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  25 Aug 1854
Classmark:  DAR 205.9: 384
Letter no:  DCP-LETT-1581
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